Physics 3B

Definitions

Axis-straight line around which rotation takes place
Rotation-object turns around an external axis
Tangential Speed-number of rotations per unit of time
Electric Fields-a vector quantity that relates the force exerted on a charge to the size of the charge
Electric Current- flow of charged particles.
Voltaic or Galvanic Cells- Converts chemical energy to electrical energy.
Photovoltaic Cell- Changes solar energy to electrical energy.
Generators- Convert kinetic energy into electrical energy.
Revolution- Objects turn around on an external axis.

Formulas

Explanation

• All the net force acted on an object is called impulse. The Impulse/Momentum Theorem states that the impulse of an object is equal to the change in momentum it causes.
• Momentum is a conserved quantity in physics. In other words it all works in different ways, such as one object might lose it's momentum in which another at the same time can gain momentum. (http://zonalandeducation.com/mstm/physics/mechanics/momentum/momentum.html).
• Centripetal force is the opposite of centrifugal force.
  It is the inward force that causes an object to curve.
  Like on a string with a weight on the end that is being spun, the weight pulls out on the string but the center pulls back.
  The outward force is centrifugal and the inward force is centripetal. If the object is traveling in a circle at constant speed, they are equal,
  As you can see by your answers, many people are confused by it. (http://answers.yahoo.com/question/index?qid=20081217212455AAhCOr0).

Demonstration